Something to keep in mind is if your thermostats are proportional that may not work with a generator.

I've contacted Helix before and asked them to elaborate on the issue:

"Hello, yes you will not be happy using any signal conditioner, UPS, even some older or sloppy power generators, ahead of digital equipment that electronically controls output power. The Sign-wave that these products produce is "square-ish" and not acceptable for use with triac driven devices. ( Including Helix DBS-1000 and any truely Proportional thermostat.) .This Square sign-wave tends to turn on the power at a low level when the system wants the power OFF.
On/Off thermostats ( at least most of them) should not have this
problem.

If your looking for back up incase of power outage...

You can set up a Ranco (On/Off) thermostat, 1-2 degrees lower
setpoint,and separate small fan and heat element.
Basically the Ranco is never putting out any heat , unless the
temperature drops to the lower (secondary system) set point. This saves the relay
inside and makes the Ranco system last a 1000 x's longer

It could also speed "temperature" recovery after opening the incubator,
and closing it.

Thanks for thinking Helix,
Jeff Washburn
Helix Controls, Inc."